@article{AM2_1984__27_137028,
     author = {Ch. G. Philos},
     title = {On second order sublinear oscillation.},
     journal = {Aequationes mathematicae},
     pages = {242--254},
     year = {1984},
     volume = {27},
     zbl = {0545.34026},
     url = {http://geodesic.mathdoc.fr/item/AM2_1984__27_137028/}
}